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Université de Fribourg

Translocation of gold nanoparticles across the lung epithelial tissue barrier: Combining in vitro and in silico methods to substitute in vivo experiments

Bachler, Gerald ; Losert, Sabrina ; Umehara, Yuki ; Goetz, Natalie von ; Rodriguez-Lorenzo, Laura ; Petri-Fink, Alke ; Rothen-Rutishauser, Barbara ; Hungerbuehler, Konrad

In: Particle and Fibre Toxicology, 2015, vol. 12, no. 1, p. 18

The lung epithelial tissue barrier represents the main portal for entry of inhaled nanoparticles (NPs) into the systemic circulation. Thus great efforts are currently being made to determine adverse health effects associated with inhalation of NPs. However, to date very little is known about factors that determine the pulmonary translocation of NPs and their subsequent distribution to secondary...

Université de Fribourg

A guide to investigating colloidal nanoparticles by cryogenic transmission electron microscopy: pitfalls and benefits

Monnier, Christophe A. ; Thévenaz, David C. ; Balog, Sandor ; Fiore, Gina L. ; Vanhecke, Dimitri ; Rothen-Rutishauser, Barbara ; Petri-Fink, Alke

In: AIMS Biophysics, 2015, vol. 2, no. 3, p. 245–258

Synthetic colloidal nanoparticles are nowadays omnipresent. Nonetheless, adequately characterizing them and interpreting the data is challenging, as their surrounding environment, e.g. the medium they are dispersed in, is often an active contributor to their size, morphology and structural integrity. In this regard, cryo-transmission electron microscopy (cryo-TEM) is an ideal methodology. This...

Université de Fribourg

Nanoparticle colloidal stability in cell culture media and impact on cellular interactions

Moore, Thomas L. ; Rodriguez-Lorenzo, Laura ; Hirsch, Vera ; Balog, Sandor ; Urban, Dominic ; Jud, Corinne ; Rothen-Rutishauser, Barbara ; Lattuada, Marco ; Petri-Fink, Alke

In: Chemical Society Reviews, 2015, vol. 44, no. 17, p. 6287–6305

Nanomaterials are finding increasing use for biomedical applications such as imaging, diagnostics, and drug delivery. While it is well understood that nanoparticle (NP) physico-chemical properties can dictate biological responses and interactions, it has been difficult to outline a unifying framework to directly link NP properties to expected in vitro and in vivo outcomes. When introduced to...

Université de Fribourg

Effects of an iron-based fuel-borne catalyst and a diesel particle filter on exhaust toxicity in lung cells in vitro

Steiner, Sandro ; Czerwinski, Jan ; Comte, Pierre ; Heeb, Norbert V. ; Mayer, Andreas ; Petri-Fink, Alke ; Rothen-Rutishauser, Barbara

In: Analytical and Bioanalytical Chemistry, 2015, vol. 407, no. 20, p. 5977–5986

Metal-containing fuel additives catalyzing soot combustion in diesel particle filters are used in a widespread manner, and with the growing popularity of diesel vehicles, their application is expected to increase in the near future. Detailed investigation into how such additives affect exhaust toxicity is therefore necessary and has to be performed before epidemiological evidence points towards...

Université de Fribourg

Cellular uptake and cell-to-cell transfer of polyelectrolyte microcapsules within a triple co-culture system representing parts of the respiratory tract

Kuhn, Dagmar A. ; Hartmann, Raimo ; Fytianos, Kleanthis ; Petri-Fink, Alke ; Rothen-Rutishauser, Barbara ; Parak, Wolfgang J.

In: Science and Technology of Advanced Materials, 2015, vol. 16, no. 3, p. 034608

Polyelectrolyte multilayer microcapsules around 3.4 micrometers in diameter were added to epithelial cells, monocyte-derived macrophages, and dendritic cells in vitro and their uptake kinetics were quantified. All three cell types were combined in a triple co-culture model, mimicking the human epithelial alveolar barrier. Hereby, macrophages were separated in a three-dimensional model from...

Université de Fribourg

Spatial SPION localization in liposome membranes

Bonnaud, Cécile ; Vanhecke, Dimitri ; Demurtas, Davide ; Rothen-Rutishauser, Barbara ; Petri-Fink, Alke

In: IEEE Transactions on Magnetics, 2012, vol. 49, no. 1, p. 166-171

Nanocarriers, including liposomes, offer great opportunities for targeted and controlled therapy. The development in this field has led to a large panel of drug delivery systems, which can be classified into 3 different nanovector generations. However, the success of such smart materials requires the control of a large variety of properties and parameters. Unfortunately, characterization at the...

Université de Fribourg

Nanoparticles and cells: an interdisciplinary approach

Petri-Fink, Alke ; Rothen-Rutishauser, Barbara

In: Chimia, 2012, vol. 66, no. 3, p. 104-109

In this article we present an overview of some of our research in the field of nanoscience. By combining two different scientific backgrounds (chemistry and biology), we investigate nanoparticle-cell interactions from different angles. This requires an interdisciplinary approach involving material synthesis and characterization, cell biology (biochemistry) and microscopy. In particular, we...

Université de Fribourg

Influence of serum supplemented cell culture medium on colloidal stability of polymer coated iron oxide and polystyrene nanoparticles with impact on cell interactions in vitro

Hirsch, Vera ; Salaklang, Jatuporn ; Rothen-Rutishauser, Barbara ; Petri-Fink, Alke

In: IEEE Transactions on Magnetics, 2012, vol. 49, no. 1, p. 402-407

When nanoparticles interact with cells, the possible cellular responses to the particles depend on an array of parameters, in both particle and biological aspects. On the one hand, the physicochemical properties of the particles (e.g., material, size, shape, and surface charge) are known to play a key role in particle-cell interactions. On the other hand, it has been shown that prior to coming...

Université de Fribourg

Improved dynamic response assessment for intra-articular injected iron oxide nanoparticles

Crowe, L. A. ; Tobalem, F. ; Gramoun, A. ; Delattre, B. M. A. ; Grosdemange, K. ; Salaklang, Jatuporn ; Redjem, A. ; Petri-Fink, Alke ; Hofmann, Heinrich ; Vallée, J.-P.

In: Magnetic Resonance in Medicine, 2012, vol. 68, no. 5, p. 1544–1552

The emerging importance of nanoparticle technology, including iron oxide nanoparticles for monitoring development, progression, and treatment of inflammatory diseases such as arthritis, drives development of imaging techniques. Studies require an imaging protocol that is sensitive and quantifiable for the detection of iron oxide over a wide range of concentrations. Conventional signal loss...